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Previously, subprograms contained a metadata reference to the function they described. Because most clients need to get or set a subprogram for a given function rather than the other way around, this created unneeded inefficiency. For example, many passes needed to call the function llvm::makeSubprogramMap() to build a mapping from functions to subprograms, and the IR linker needed to fix up function references in a way that caused quadratic complexity in the IR linking phase of LTO. This change reverses the direction of the edge by storing the subprogram as function-level metadata and removing DISubprogram's function field. Since this is an IR change, a bitcode upgrade has been provided. Fixes PR23367. An upgrade script for textual IR for out-of-tree clients is attached to the PR. Differential Revision: http://reviews.llvm.org/D14265 llvm-svn: 252219
43 lines
1.7 KiB
LLVM
43 lines
1.7 KiB
LLVM
; REQUIRES: object-emission
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; RUN: %llc_dwarf -O0 -filetype=obj < %s > %t
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; RUN: llvm-dwarfdump %t | FileCheck %s
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; Also test that the null streamer doesn't crash with debug info.
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; RUN: %llc_dwarf -O0 -filetype=null < %s
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; generated from the following source compiled to bitcode with clang -g -O1
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; static int i;
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; int main() {
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; (void)&i;
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; }
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; CHECK: debug_info contents
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; CHECK: DW_TAG_variable
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; Function Attrs: nounwind readnone uwtable
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define i32 @main() #0 !dbg !4 {
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entry:
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ret i32 0, !dbg !12
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}
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attributes #0 = { nounwind readnone uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!11, !13}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: true, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !9, imports: !2)
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!1 = !DIFile(filename: "global.cpp", directory: "/tmp")
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!2 = !{}
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!3 = !{!4}
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!4 = distinct !DISubprogram(name: "main", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 2, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "global.cpp", directory: "/tmp")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !{!10}
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!10 = !DIGlobalVariable(name: "i", linkageName: "_ZL1i", line: 1, isLocal: true, isDefinition: true, scope: null, file: !5, type: !8)
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!11 = !{i32 2, !"Dwarf Version", i32 3}
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!12 = !DILocation(line: 4, scope: !4)
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!13 = !{i32 1, !"Debug Info Version", i32 3}
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